Door chime control switch



Nov. 23, 1948. H, ss 2,454,342

DOOH CHIME CONTROL SWITCH I Filed Dec. 30, 1947 kgz f INVENTOR.

Q i i Patented Nov. 23, 1948,

UNITED STATES. PATENT OFFICE noon CHIME CONTROL swrron William H. Ross, Phoenix, Arlz. Application December 30, 1947, Serial No. 794,727

This invention relates to push button switches, and more particularly to a push button switch device for use with door chimes to provide a momentary contact when the button is pushed inwardly, whereby the chime mechanism is momentarily energized, and to provide a second momentary energization of the chime mechanism when the button is released, whereby said mechanism is in a de-energized condition during the time that the button is held in depressed condition.

A main object of the invention is to provide a novel and improved double-acting door chime control device providing the action above described, said device being very simple in construction, easy to install and extending the life of the chime mechanism with which it is employed by preventing energization of said mechanism over excessive periods of time.

A further object of the invention is to provide an improved door chime push button control device which is compact insize, rugged in construction and inexpensive to manufacture, said device providing a timed double chime signal responsive to the act of pushing and then releasing the push button element thereof.

Further objects and advantages of the inven- 1 Claim. (Cl. 200-159) end wall of easing ll.

' plunger.

and exposedat the surface thereof is a metal ring member 18 having an extension is termi-- natlng in a lug 20 positioned at the end of the Secured to lug 20 is one end of a coiled spring 2|. Theother end of spring 2| is secured to the head of a bolt 22 extending through the Spring 2| therefore electrically connects lug 2| to bolt 22 as well as acts to bias plunger 14 outwardly to the full line position thereof shown in Figure 1.

Embedded in the casing H is a conductor 23 terminating at one end in a threaded stud 2| adjacent bolt 22 at the end of the casing and terminating at its other end in a contact element 25 flush with the surface of bore l3 and located substantially midway between the normal full line position of ring member l8, shown in Figure 1, and the innermost position assumed by said ring member when button I5 is pushed inwardly to its dotted line position. i

Bolt 22 and stud 24 are connected in series with the energizing circuit for the door chime mechanism. When button If: is pushed inwardly it causes ring member l8 to make momentary contact with element 25, closing the chime energizing circuit for a short period of time and cansing a chime to be produced thereby. The circuit tion will be apparent from the following description and claim and from the accompanying draw- Figure 1 is a longitudinal cross-sectional view taken through a door chime control device constructed in accordance with the present invention,

Figure 2 is a cross-sectional view taken on line 2-2 of Figure 1.

Referring to the drawings, ll designates a cylindrical casing formed with suitable insulating material, such as plastic or the like, the forward end of the casing ll being provided with an annular flange I 2 for securement of the casing in the door frame or other support adjacent the door with which the chime control device is to'be used. Casing H is formed with a cylindrical bore l3 and axially slidable in said bore is a plunger l4 also of insulating material formedat its forward end with an enlarged head or button l5. Plunger I4 is formed with an annular groove f6 and projecting into said groove is the end of a stop screw ll threaded through the wall of casing l i, said screw limiting axial movement of the plunger to movement between the dotted line position of button l5 and the full line position thereof shown in Figure 1.

Embedded in the lower portion of plunger I4 is broken as soon as ring member l8 moves past element 25 as it continues its inward movement. I

When button I5 is released, another chime is produced as ring member l8 moves past element 25 on its return path under the biasing action ofspring 2!. v

As a result, it is almost impossible to cause the chime mechanism to be continuously energized, thereby extending the life of the mechanism and avoiding the annoyance of having the door chime mechanism operating continuously when the signal button is pressed inwardly and held for an excessive period of time.

While a specific embodiment of an improved door chime control device has been disclosed in the foregoing description, it will be understood that various modifications within the spirit of the invention may occur to those skilled in the art. Therefore, it is intended that no limitations be placed on the invention except as defined by the scope of the appended claim.

What is claimed is:

A momentary action electric switch, comprising a casing formed of insulating material and provided with a cylindrical bore and having an end, an axially shiftable cylindrical plunger mounted within the bore and provided near its longitudinal center with an annular groove forming inner and outer stop shoulders, a stop secured to the casing and projecting into the groove and engageable by the shoulders to limit the inward and outward axial movement of the plunger, an annular conducting ring surrounding the plunger near its inner end and embedded in the plunger and flush with the periphery of the plunger, an axial conducting extension carried by the conducting ring and embedded in the plunger and extending axially inwardly to a point adjacent to the inner end of the plunger, a compressible conducting coil spring disposed within the bore inwardly of the plunger and having its outer end electrically connected to the axial extension and serving to bias the plunger outwardly, a terminal bolt mounted upon the end of the casing and extending into the bore and being electrically connected to the inner end of the spring, and a single generally axial conductor embedded in the wall of the casing and including a radial contact :0 2,338,481

REFERENCES CITED The following references are of record in the tile of this patent:

UNITED STATES PATENTS Number Name Date 662,234 Hazazer Nov. 20, 1900 2,198,659 De Vincenzi Apr. 30, 1940 Batcheller Jan. 4, 1944 

